Boyfriend with weird behavior ?

Hi. My bf and I have been together 2 years and engaged 1. We moved to another city a year ago but wanted to spend Christmas in the town where we used to live and where my family live as well. We are staying in a hotel. Yesterday morning around 7:45am he felt sick and I offered to go to the pharmacy to get him something and he said yes and also some breakfast. He has been texting/emailing ppl from work he said, I asked the favor not to work during our trip. Ok when I was out I texted him asking something, he didn't respond, I drove back and he called me and hung up, then called me again asking where I was, I was almost there and he said ok. And he never calls asking that. I got to the room and he was all sweating looking like nervous and I asked what's going on he said that ppl from Wk don't stop calling and said really? This early? In holidays? that's why he didn't respond my text. I didn't believe it since it was earlier than normal for work, he was acting weird like not him, I'm thinking he wanted to know where I was so he knows how far I was to have a chance to call somebody and he looked guilty. I think he called some girl, I sat upset saying we had an agreement about not working and he said he felt so terrible about it like apologizing so extreme just for a call. He wrote "I love u" on a note pad and he asked me what does it say? And I was like what?? He never but never does that and my gut feeling is that he felt guilty about something and almost got cough. That's why the sweating. Do you think that's a guilt reaction or it's my imagination?

We went later to the dentist and he was going to pay. He said he was going to wait for me and when I finished with dentist he wasn't there and I texted him asking where he was but didn't respond. He got there saying he was on another call with his boss BS! He paid and we left. I asked him why everything is happening when I'm not around and he got upset saying he doesn't know and if I was accusing him of something..